Question 1

Which of the following statements best describes the role of RNA polymerase during transcription in bacteria?

Accepted Answer

RNA polymerase synthesizes an RNA strand by matching ribonucleoside triphosphates (NTPs) to complementary DNA bases.

Question 2

What is the function of the sigma protein in bacterial transcription initiation?

Accepted Answer

It recognizes promoter regions and helps RNA polymerase bind to the correct site on DNA.

Question 3

Which sequence is commonly found about 10 bases upstream of the bacterial transcription start site and is crucial for promoter recognition?

Accepted Answer

The TATAAT box

Question 4

During elongation in bacterial transcription, nucleotides are added to which end of the growing RNA molecule?

Accepted Answer

The 3' end

Question 5

Which event signals the termination of transcription in bacteria?

Accepted Answer

The formation of a hairpin structure in the RNA transcript

Question 6

How does transcription termination differ between bacteria and eukaryotes?

Accepted Answer

Bacteria use a hairpin structure, while eukaryotes use a poly(A) signal and subsequent RNA cleavage.

Question 7

Which of the following best explains why eukaryotic primary transcripts (pre-mRNA) must be processed before translation?

Accepted Answer

They contain both exons and introns, and introns must be removed.

Question 8

What is the role of the spliceosome in eukaryotic cells?

Accepted Answer

It removes introns from the primary RNA transcript.

Question 9

Which of the following is a direct result of alternative splicing in eukaryotes?

Accepted Answer

A single gene can produce multiple different proteins.

Question 10

A mutation prevents the addition of the 5' cap to a eukaryotic mRNA. Which of the following is the most likely consequence?

Accepted Answer

The mRNA will not be able to bind to ribosomes efficiently and will be more susceptible to degradation.

Question 11

Which of the following best describes the difference between exons and introns?

Accepted Answer

Exons are present in the final mRNA, while introns are removed during RNA processing.

Question 12

Which of the following is NOT a function of the poly(A) tail added to eukaryotic mRNA?

Accepted Answer

It serves as a signal for transcription initiation.

Question 13

A researcher heats viral DNA to form single-stranded DNA and incubates it with viral mRNA. Loops form along the hybrid molecules. What do these loops represent?

Accepted Answer

Regions of DNA that are not present in the mature mRNA (introns)

Question 14

Which of the following accurately describes the direction of RNA synthesis by RNA polymerase?

Accepted Answer

RNA is synthesized in the 5' to 3' direction.

Question 15

Which of the following is true about the coding (non-template) strand of DNA during transcription?

Accepted Answer

It matches the sequence of the mRNA, except that T is replaced by U.

Question 16

Which of the following best explains why eukaryotic transcription and translation are separated in space and time?

Accepted Answer

Transcription occurs in the nucleus, and translation occurs in the cytoplasm.

Question 17

A mutation in a eukaryotic gene prevents the removal of introns from the pre-mRNA. What is the most likely outcome?

Accepted Answer

The mature mRNA will contain introns, potentially leading to a nonfunctional protein.

Question 18

Which of the following is a key difference between bacterial and eukaryotic promoters?

Accepted Answer

Bacterial promoters are recognized by sigma proteins, while eukaryotic promoters are recognized by general transcription factors.

Question 19

Which of the following best describes the function of small nuclear ribonucleoproteins (snRNPs) in eukaryotic cells?

Accepted Answer

They catalyze the removal of introns from pre-mRNA during splicing.

Transcription, RNA Processing, and Translation: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards